Products > Thermal Imaging

ISG 2.4GHz RF Video Link Receiver and Monitor for thermal cameras

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Ultrapurple:
If it's UK Police surplus and operating above 2.50GHz then you will need to either retune it to somewhere 2.4-2.5GHz and use a suitable transmitter or, as you suggest, move to 5.6GHz. The 2.50-2.69GHz band has been re-allocated (sold) for mobile phone uses (at least in the UK).

The UK Frequency Allocation Table makes interesting bedtime reading.

Fraser:
I just managed to purchase a used 1.394GHz 500mW Video Transmitter and Receiver set made by RDT Ltd  :-+ They cost me £30 for the pair, so very reasonable considering what they would have cost new  :) The predicted ‘line of sight’ range with the provided antennas is 750m to 1500m  :-+
The units are quite compact with a case size of ~100mm x 60mm x 30mm.

I may use these to convert the ISG Monitor/Receiver to the dedicated licence exempt UK video transmission frequency that is centred on 1.394GHz with a 10MHz channel span. You do not see 1.394GHz video links much these days and hopefully the channel is quiet and should not interfere with my Wi-Fi network, unlike some 2.4GHz video transmitters.

Fraser

Bill W:
1394 MHz is the frequency used for the Argus cameras analogue transmitters for the UK as well.  A few other countries also gave users licenses for it, despite their band plans.

Not just clearer of other ISM randoms but also better building penetration due to the lower frequency.

Bill


Fraser:
Bill_W,

Yes indeed, 1394MHz is a useful licence exempt frequency. I feared that it had been removed from the licence exempt band plan as most references referred to the ISM bands where 1394MHz was not included. After some digging in the Ofcom document portal I found that 1394MHz is still alive and kicking  :-+  :phew:  Not only is 1394MHz better at penetrating structures, the Ofcom regulations permit a transmitter output power of 500mW which is a ‘healthy’ amount amount of RF energy for longer distance links or “challenging” situations. My transmitter is capable of the full 500mW output, if such is required  :-+

I have a 1394MHz colour video camera languishing somewhere in my lab. I shall have to dig it out. Time to look for some 1394GHz patch aerials or to make my own, as I have for 2.4GHz work.

Interestingly, 1394MHz is not legal for Air to Ground use in the UK. It is a ground to ground only frequency according to Ofcom. I presume this was an effort to control user to user interference with only the single 10MHz channel available.

I seem to recall that an old Amstrad analogue satellite TV box could be modified to receive the 1394MHz frequency allocation. The good old days when operating transmitters above 1GHz still seemed impressive  ;D

Fraser

Fraser:
I just had a look in my garage as I suspected I had some brand new professional RF video links...... annnnd I have  ;D

I have six Genie CCTV waterproof 5.8GHz Transmitter plus Receiver sets, complete with whip antenna on the transmitter and patch antenna on the receiver  :-+  The electronics package is small and easily removed from the waterproof cases. The sytem is only 25mW transmitter power but at 5.8GHz and 7 channels, it will not interfere with my 2.4GHz Wi-Fi network :-+

I now have a choice over which frequency band to use for my video link monitor  :)

Fraser

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